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M. L. NELSON. MULTIOFFICE TELEPHONE sysrm 17,632

April 1, 1930 Original Filed Feb. 9, 1921 7 sh t sh 't 1 IniTfltTr Ha'fZT LNels-m M. L. NELSON MULTIOFFICE TELEPHONE SYSTEM '7 Sheets-Shet 2 April 1, 1930.

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April 1, 1930.

'M. 1.. NELSON MULTIOFFICE TELEPHONE SYSTEM Original Filed Feb. 9. 1921 m MQ NQ N '7 Sheets-Sheet 4 A rifi a 12312.

M. L. NELSON MULTIOFFICE TELEPHONE SYSTEM Rec 3 T Shea tsfih set 5 April 1, 1930;

\WN QM Original Filed Feb. 9, 1921 Harim L" N 515511 v M. L. NELSQN Apnl 1930' MULTIQFFICE TELEPHONE SYSTEM Original Filed Feb. 9. 1923 7 Sheets-Sheet 6 InUEn DI m, L. w afiim MULTI OFFICE TELEPHONE SYSTEM 7 \WW ww\ H w r n mm QM Original Filed April 1, 193i w #5; u :21. Kiel:

Reissued Apr. 1, 1930 UmTEo s-TATas PATENT OFFICE Man'r'm 1 Manson, onPARK Rinse, ILLINOI ASSTGNOR, BY mam assieitimn'rs,

] ro'AUr'oMATIc'ELEcrnIo m'cjoacmoneo, ILLINOIS, AcoRroRA'rIoNoF DELA- WARE oi igifiala' iication filed, February 9,'1921,seria1"m'. 443,688. Renewed March 29, 1926. Original 1%..

mealtimes TELEPHONE SYSTEM "1,814,678; dated d 'anuary is, 1927. Application for reissue filed January 11, 1930. Serial No. 420,262.

2 The present invention relates to "multiofiicetelephonesystems, .more especially to such systems as comprise both manual and automatic .o'ifices, or exchanges; and the object of'the' invention, broadly stated, istne provision V of 'n'ew and; improved arrange- 'm*ents"for handling those calls which orig- -i 1rate at-a manualofli'ce and which are completedin an automatic office.

Various schemes have been proposed beforeforhandlin'g the class of connections referred to'and a number of them have been used with some degree of satisfaction by operating telephone companies. The fact is, however, that so far as applicant is aware all of the systems heretofore 'used,o'r suggested, are either excessively complicated or else they'do not perform the desired functions with; that degree of efficiency or simplicityjwhichis' desirable. The present circuits have been designed, therefore, with the shortcomings of prior systems in mind, and with a view to producing an improved system'having the maximum simplicity, and capable "of fdoing'the' required work at high speed and underuniform operating conditions.

' An' essential feature of the invention is the B operat'ors" sending equipment at the 'automatic"exchange. This apparatus includes" a'novel sending switch, and a plu- 'rality"of"rel ay storagedevi'ces, of newfde "sign, *tog ether with circuits whereby the digits, corresponding to successively act-uated digit' keys, are registered on the storage devices, whereby the storage devices .successively co'ntrol .th es'ending switch according to theregistereddigits, and whereby the entire apparatus I is automatically d'isassociatedjfrtm the trunk linein use when the connection-is compl'eted. There are other features notuiow specifically mentioned, all

of whichwill 'beflp'o inted 'out and fully explained hereinafter with reference to the ac companyin'g drawings.

"For an understanding of the cirbuit s, Figs.

connection, when established, involves a manual cord circuit such as the cord circuit 0, Fig. 1; an iIiter-oifice trunk line, manual to automatic, and associated trunk equipment, shoWn in Fig. 2; a first selector switch D,Fig. 3; a second selector switch such as the second selector E; and a final connector switch such as the connector H, Fig. 4. The apparatus 'shown'in Figs. 5, 6, and 7 constitutes a' B dperators sender which is used 'to control the setting of the automatic switches, "and'which may be temporarily associated with the trunk line for this purpose. Fig, 8 shows a lamp indicating device associated with the sender shown in Figs. 5, 6, and 7. l

The equipment shown in Fig, 1 comprising the telephone station A and the associated line e'quipm'ent at the exchange, the operators cord circuit 0, and the A operators head set, is all manual equipment of well known type and on this account will not have to be described.

The inter-office trunk line, comprising conductors 'and 3 1, is one of a large group of similar trunk 'lines and extends from the jack'Jin the outgoing trunk multiple at the Aboard, in' the manual exchange, by way of the B opera'to'rs position, shown in Fig. 2 to the first selector D, which is shown in Fig.3. At the B operators position the trunk'line is normally open and is provided with a group of relays, whose circuits are sho'wnin full, and whose operation will' also be described'in the course of the general.

ranged, however, for a directive control in both the vertical and rotaryunovements. All of these switches are operated according to the well known two wire system of control. The connector switch H has. access to 100 subscribers lines, one of which is the line extending to automatic. sub station A. The reference character C indicates a rotary line switch of well known type which isindividual to the line of substation A and which is used by the subscriber thereat for making outgoing calls.

The l3 operator7s sender shown herein comprises a set fof digit keys, shown in the lower left-hand corner ofFig. 2, asending switch indicatedby the reference character S, and including aplurality of associated relays, all of which are'shown in Fig. 5, a first digit storageQdevice, shown in Fig. 6, a second digit storage device, shownin Fig. 7, and third: and fourth digit storage devices, which arevnot shownbut are in all respects exactly like the second digit storage device which is shown in Fig. 7. There is also a lainp=indicating device,'shown in Fig. 8 on the same sheet with Fig. 2. c

i The digit keys Noel to 0, inclusive, are ordinary self restoring keys, or push'buttons, located in'a single row in front ofthe B operator, and control thesetting of the storage devices. There is also a release key? R and a'lamp L*- located in" the samerow with the digit keys. The sending switch S, in Fig. 5, is a simple rotary switch having two horizontal rows of bank contacts and the two wipers 207and 208 associated therewith. These wipers are adapted to be driven by any suitable form of ratchet mechanism ina forward direction only by means of the stepping magnet 206. The cam 298 is mounted on a constantly rotating shaft which is driven by a small motor, or other suitable means, at a speed of about ten revolutions per second. This is the impulse sending cam and may be common to a number of. difierent senders. v

The first digit storage device, shown in Fig. 6, comprises the digit relays 271-270, inclusive, and, the five relays 250-254, inclusive. The other storage devices are very similar to thefirst digit storage device, and all of themv will be described in full hereinafter. f l

A little further description of the apparatus at the B operators position may now be advisable before proceeding with the operation of the system. In addition to the inter-office trunk line, shown in Fig. 2, there may be perhaps fifty or more other trunk .pled at the relay equipments of all the interoflice trunk lines. Thus, any sender may be connected with any inter-oflice trunk line. The local trunk line associated with the sender shown in the drawings, comprises conductors 221-224, inclusive, which conductors are connected in multiple to contacts of relays, such as the relay v45, associated with the several inter-oflice trunklines. Althoughnone of the other senders are'shown,

the local trunk line associated with the second sender is shown in the drawing at the right of Fig. 2, and comprises conductors 221 to 22 i, inclusive. The local trunklines associated with the other twosenders are similar to the one shown and, therefore, it

is believed thatthe arran ements will be readily understood without rther explanation. i

Thelamp indicating device, shown inFig. 8, is individual to the sender illustrated, and there is a similar indicating device for each of the other senders. This indicatingdevice comprises a plurality of banks of switch-board lamps, there being a lamp in each bank for each of theten digits. The number of. different banks, of lamps will, of course, depend upon the number of digits in the telephone numbers; for four digit numbers four banksof lamps will, of course, be required as illustrated in the drawing. The digits to which the lamps correspond are printed on a semi-transparent screen behind which the lamps are located, and these numbers are ordinarily scarcely discernible. When the lamps immediately. behind any seriesof. digits are lighted, however, these vof the several storage devices. Thus, the

individual conductors, suchas conductor 284, whichcome from the tenqlamps. in the first digit bank are connected to springs of relays, 271270, inclusive; the conductors,

such aswconductor 335, coming from the lamps of the second digit bank are condigit relays-in .the third 'and fourth storage devices, respectively;

The .oper-atiomof- 'the system in establishing; a:..-telephone.- connection. .will now. be explained, it a being assumed .for this purpose, thatthe-subscriber at-sub station .A in the. manual 'rexchange: desires to obtain .connectionwithathe subscriber at sub station A in. the automatic exchange.

at sub-zstation .A; a circuit .is completed :over the .alineiconductorsflnnd 3 forthe linerelay 4; which is. accordingly. energized and lights the line.lamp.L.. Thisnotifies then;

operator, ate-whose position the answering jackJnppears, that a call hasbeenreceived and -.'she will. respond by inserting the: ans

swering/plugofjan. idle. cord circuit, the. cord icir'cuit 10, for example, in the ,jackJ.

Upon .the. insertion of-the plug, a circuit is completediover. the sleeve conductor thereof which" includesthe, cutofimelay 5 of the calling. line,- andthe supervisory lamp L, in

thecord circuit in series. The cut oifrelay.

5 is accordingly energizedand-disconnects the line relayl! Thesupervisory lamp L would rbe. liglrtednt, thesame time were it not: forjthefacti thatgthe receiver is off at sub: station A, whose transmitter is nowsupplied 'with: current from the cord circuit.- As iaeresult, the supervisory relay 8-in theringside ,of the cord circuit is. energizedand.:shunts .out the lamp L. to prevent it from being lighted;

The A operatorwillnow. throwher key, K. to listening position in order to obtain.

from the calling, subscriber the number of the .partywithwhom ;he desires to converse. Havingkascertained that'the desired number. is'the- No.=4567 in. the automatic oiiice, the operator will restoreher listening key and will depress. the proper callcircuit button in. order .to,connecther headset with the call:.circuit'extending-to the desired ofiice, or exchange. The call circuit button atthis particular A5 operator-7s position, which is associated.- .with; the particular automatic ex-.

change .in-question, isthe button P, and Wllfii-IthiS-lS depressed-theA operators head setis, connectedgdirectly; with the-B operators :head-set. in the 1 automatic. oflice. The A roperator now, repeats the .No. 4567 to the B-ioperator, and. this. number is registered bythe latter; operator by means ofthedigit keys associated Wll3l1;,0.116 of her senders as sooneas it is received,;it-beingunderstood, of course, that glll .the present case; the; sendervvhich is;- shown in the. drawing L is the one which: will; be. used- In; eg st ing; he

The, telephone number ati sub; station A will be. assumed as NIX-4567: When the. receiverisremoved:

number, theB operator will; depress; the digit'keys 4, 5,6, and 7 in.rapidqsuccession andn-the entire number is completely registered practically as soon as the A operator. has finished transmitting it. As soon as, the ASOPQIEltOIlS throughtalking the B oper; ator will reply with the numberct an idle interoiiice trunk line. The Aoperaternow inserts the calling plug of the cord circuit in use in the designated jack in the outgoing trunkgmultiple Assuming that thetrunk linescomprising; conductors and 81 is the ,3 trunk; line assigned,- the plug -will be in: sorted in the jack- Jand a circuit issim mediately completed rover the tWo sides-of thetrunkline in ser-ies for the bridged rev lay 4O at-theB operators positioin Relay 40. is. energized.by current flowing -t'rom the cordcircuit at the A board andcloses a circuit forthebusy lamp L hisnotifies the B2; operator that the-A; operator; has

' taken the, trunk, and shewill .now depressv the key, K which is 3 associated with the trunk line innse and also with the sender upon-whichthe desired number has been registered in order ,to connect this. sender withthe; trunk, line. The sending switch .S,:

Fig. 5, is now operated. under the control oi. the several storage devices in succession and four series oiimpulses' are .transmitte dover the trunk line comprising.conductorsBO and 6 1, gconnnecting Figs. 2 and 8, whereby.tl1e, first; selector-D, a secondselector, such as. the selector E, and aconnector, suchas the connector H, are o'peratedinorderto. complete connection to thedesired subscribers line.

The .B operator, hayingactuated thetrunk, keyg K,, has done all that is required of her. toward the establishment of .the connection and;need pay no further attention. to it.

The-sender, upon which the number has been registered, controlsv the automatic. switches. without any further attention and when the last switch .has :beenoperated the sender is automatically disassocia ted, from the. trunk line and. is. ready. for use. in registering anotherflcalled numberu We will return now to .thepoint where the, B. operator begins to register..the number transmitted to her by. the A operator, inorder to go into the subsequentcircuit operations more'in detail. Theten digit relays of the}. first digit. storagedevice are normally-cons,

'nected to thetenleads or conductors coming. from the .ten. digit ,keys, and when the operator, depressesthe No. tdigit key a circuit is completedover conductor. 234 ,.for. the fourth digit relay. Uponv energiz ing, relay 27 i prepares a lockingcireu'it it'or, itself *at armature281 connectsvthe ground ed conduct-or. 228 .to conducton284.which. ex tends to. the .No., 45131111) .in Q the first. digit bank of the lamp, indicating device, and causes the digit; 4 to be, immediatelyv dis-. played; and. connectsthe grounded, conduc tor 288 with the conductor 26 4 which extends the digit keys.

to the lower bankof the impulse sending switch Sand there terminates in bank contact 294. The operator depresses the. digit key only for an instant and when it is released, relay 274 "is held up over the hereinbe fore mentionedlocking circuit which in-* eludes relay 252 andthe grounded conductor 226. Relay is accordln 'ly energized 111 series with relay 274, having been prevented from energizing before by the short-circuit- Relay 252 also connectsground'to the holding conductor 223 at armature 260, and at armature 259 connects ground to conductor 285 extending to the'second digit storage device, Fig. 7, thus completing a circuit for relays 304 and 305 in series. Upon energizing, these relays connect the ten digit relays 321 to 320, inclusive, to the ten conductors coming from the digit keys. In this manner the second digit storage device is prepared for registering the second digit.

It will be clear now that when the No. 5

digit key is depressed, a circuit will be closed, over conductor 235 forthe fifth'digit relay 325 ofthe second digit storage device. Up-

I on energizing, relay 3 25 prepares a locking ClICUlt for itself at its armature 331, connects the grounded conductor 228 to the lamp conductor 335 at armature 333, thereby dis-' playing the No. 5 digit in the second digit bank of the lamp indicating device, and con nects conductor 388 to conductor 265 at armature 332; The latter conductor extends to the lower bank of the sending switch Sand terminates there in bank contact 295.

lVhen the'No. 5 digit k'ey'is released, ground is removed from conductor 235 and relay 325 becomes locked in series with relay 303 over conductor 285. Relay 303 is accordingly energized in series with relay 325 and at its armature 312 breaksthe circuit of relays 304 and 305, whereupon these relays fall back and disconnect the digitrelays 32l320, inclusive,from the conductors coming from the digit keys. Relay 303 also grounds the holding conductor 223 at its armature 3'11, and at itsarmature 310 groundsthe conductor 385 which extends to the third digit storage device, thereby completing a circuit for the relays, corresponding to relays 304 and 305, which connect the ten digit relays of the third digitstorage device with the conductors coming from the digit keys.

When the operator depresses the No. 6 digit key, a circuit is completed over conductor 236 for the sixth digit relay in the third digit storage device and this relay is energized with a result similar to that de scribed inythe' case of the, two previously energized digit relays, andit follows that the digit 6is displayed in the third digit bank of the lamp indicating device, and a circuit 1 is prepared for"grounding conductor 266 which extends to the lower bank of the sending switch S and terminates there in bank contact 296. QVVhen the operator releases the. No. 6 digit key,'the sixth digit relay in. the third digit storage device becomcslocked' in? series with the associated relay, corresponding to relay 303 of the second digit storage device, and this relay, upon energizing,

breaks the circuit of the relays through the medium of which the digit relays were connected to the conductors coming from the digit keys, whereby these digit .relays are again disconnected. Ground isalso placed upon the holding conductor 223-in the third digit storage device and atthe same time. ground is placed upon the conductor, cor-* responding to conductor 385, which extends to the fourth digit storage device, whereupon a circuit is completed for a pair of relays in said device, corresponding to the relays.

30.4 and 3050f the second digit storage device, these relays having the function Of connecting up the ten digit relays of the fourth digit storage device to the conductors GO1I1.

ing fromthe digit keys.

operations which take place at the fourth digit storage device are similar to those de-" contact 297 ofthe sending switch S. After the No. 7 digit key is released, the energized digit relay becomes locked in series'with a relay, corresponding to relay 303, which is energized in order to groundthe holding conductor 223 and also to break the circuit When the No. 7 digit key is depressed, the l of the relays which have previously been f efiectiveto connect the ten digit relays of the fourth-digit storage device withthe conduc-" tors coming from the digit keys.

From the foregoing, it will be understood that the fourth,fifth, sixth and seventh digit relays in the first, second, third, and fourth storage devices, respectively, are now locked up, with the result that the telephone number 4567 has been displayed on the lamp indicating device, and with-the further result that bank contact 294 of the sending switch S has been grounded, while bank contacts 295 296' and 297 have. been connected with in the last three storage devices, respectively, wherein circuits have been prepared for grounding these bank contacts also at the proper time. 'Itshould" be lE-J 17,esa

is located in line with thedigit -keys *of the sender,- upon which the number has 'just been registered-, is alsolighted inasmuch as it is-connected with the grounded holding. conductor 223. The function of the lamp indicating device,- upon which the digits are displayed as fast as they .are registered, is to'indicate completed telephonenumbers to the B operator with a .vi-ewto affording her a check on the accuracy of her work. In order to obtain the best results and the maxi-- mumispeed .of operation it is intended that the B- operator .will .register the digits in the-telephone numbers as they are transmitted to her by the A operator, from which,

it will be evident "that the digit keys are necessarily operated with great rapidity, andin- .quicksuccess-ion. Although an experienced operator soon becomes-accustomed to.- this and will make very few mistakes, there will be times-nevertheless when-she is intc'rruptedin her work or for some other reason 1 is uncertain :whether she has registered the correct number or not, andas such times the-lamp indicating device affords a convenient method of "at once ascertaining What number has actually beenregistered. If itis not desired ,to *use; the indicatingdevice constantly, a key' may be inserted in thebattery conductor in order-to disconnect the current supply from the lamps',-and the key may then be operated-whenever itis desired tOyShOW upsome particular number.-- In case an inspection-of theindicatingwdevice should show that a telephone number has been registered inaccurately, the release key R may be actuated in order to energize relay 203"for the purpose ofrestoringjthe digit relaiys of the-several storage devices-to norma position. Thexmanner-inwhich this is acoomplished 'by the operation of relay 203 will be clear fronr thesubsequent explanation of the restoration of these relays under ordinary circumstances, consequently it will not benecessary to make! any detailed ex planationof it at this time.

Having completed the registration of the number,-:t-he B operator assigns a trunk to the A operator, as previously explained-candas soon-asthe AL operator has taken the trunk, as indicated by the lighting of the busy'lamp If", the -B ,operatonwill actuate" the trunkkey- K, :By "thisitmeans. a circuit. is" completed for the upper winding of :relay 45 by wayof grounded: conductor 56. I Upon ergiz-ing, relay -45 locks itself to:-the:glround-- ed holding conductor 223' atv its armature .52, closesa :circuitfor the. upper winding of relay 44- at'armaturez 51, and at 'armatures 50 and 53 connects the .trunk conductors-60 and 161 Wlth."the.-COIldl1ClZOIS 221: a1'1d1222 oomingsfromi the: sending. switch 98,"- Fig; 5

Gonductors 221 and 222 are normally 1 connected together at armature 212 and also at armature 214 of relays 201and 202 of the sending switch S, and it follows, therefore, that a circuitis completed over the trunk conductors 60 and 61 for the line relay 65 of the first selector D, Fig. 3. Upon en ergizing, relay 65 closes a circuit for the slow acting-release relay :66. The latter relay, upon energizing, opens a point in the circuit of the release magnet 72 and prepares a circuit for the vertical magnet 7 0 in the customary manner. 7 7

Relay 44 is operated when the circuit is closed through its upper winding and completes a locking circuit for itself at its armature 48. Inadditionrelay 44 closes apair of contacts in the trunk conductors in'order that when the relay 45 deenergizes, as will occur shortly, the said trunk'line may extend continuously through the operators position.- hen relay 45- is energized, as

just explained, the conductor 224 is grounded, being connected witlrconductor 223 at armature 52, and a circuit is completed for slow acting relay 204, Fig, '5; Upon energizing, relay204 closes a circuit for slow acting relay 205 atits armature217 and at its armature 218 disconnects ground from the conductor 228. The latteroperation extinguishes the lights in the lampindicating device, and when the slow acting relay 205 pulls up it opens the normal ground connection to conductor226 at its armature 219 and substitutes therefor a ground coming from the working contact of armature 218 of relay 204. Since relay 204 is already energizedand since the contacts at armature 219 are of the make before break type, conductor 226 is held grounded continuously during this operation; In addition to causing the operation of relays 204 and 205, the grounding of conductor 224*produccs another result, which is the closure of a circuit for the impulsing relay 202. This circuit is broken at the rate of about t'en times per second by the constantly =r'ota-ting'cam 298, and the-circuit is accordingly closed the first time the said cam come's'into'th'e proper position after the conductor 224 is grounded. Relay 202 is now intermittently energized and 'deen'ergized bythe operation of cam 298.2 Atthe first energization relay 202 does notopen the circuit of the line relay 65 of the'firstselector D at armature 214 because this circuit is closed also at'armature 21-2 of relay 201. At armature 215, however, a circuit-is completed for the stepping magnet 206 of the sending switch S and this magnet is energized. Upon the deenergiz'ation of relay 202 the circuit of the stepping magnet 206 is broken and the said magnet retracts its armature, thereby advancing the wipers 207 and 208 one step. The wiperj20'? now engages-the first grounded'contact in its associated-bank and thereby closes-a circuit for the slow=acting relay 201 which energizes and prepares a locking circuit for slow act ing relay 200. Relay 201 also opens, at

. armature 212, the shunt circuit which nor mally renders the impulsingrelay 202 ineffective to interrupt the circuit of the line relay of the selector D. The impulsing relay 202 continues to be energized and deenergized intermittently bythe operation of the cam 298, andat each energization this relay will separate the two conductors 221 and 222 and will thereby produce a series of interruptionsin the circuit of the line relay of the selector D. At the same time relay 202 transmits a series of impulses to the stepping magnet 206 at armature 215, and the sending switch S is thus driven synchronously with the first selector. 6 After four interruptions have been produced in this way, the stepping magnet 206' will have been energized'four more times}, and the wiper 208 will be advanced into engagement with the now grounded bank contact 294. A circuit is thus completed for the slow acting relay 200, whichinimediately energizes, establishing a locking circult for itself at itsarmature' 210, and at its armature 211 opens the circuit'of the impuls'ing relay 202, thus preventing the transmission of any more impulses over the trunk circuitfor the time being. Relay 200 also closes a new circuit for the stepping magnet 206 at armature 209, and since this circuit'includes an interrupter contact controlled by the stepping magnet itself, the said stepping" magnet will operate in the manner of a buzzer and the switch will be advanced automatically until wiper 207 arrives at the first ungrounded contact in its" bank which, as shown in the drawing, is the twelfth bank contact.

pl'eted for relay 200 by the arrival of wiper 208 at grounded bank contact 294, circuit is completed by this wiper which extends 5? continues to advance'its wipers and as soon as wiper 207 reaches its twelfth bank 6 contact, relays 201 and 200 are deenergized, as is explained more in detail hereinafter. Ground is thus removed from conductor 227,

andrelay 251 will become locked'in operated position overv a circuit which includes relay.

25.0 and the grounded conductor 226. Relay 250 is, therefore, energized with, the result:

that conductor"227 is disconnectedfrom relay 251 and'istransferred by way ofconductor 287 to the corresponding relay302- of the second -digit storage: device. *Further, re-

During this time certain opera-3' tions are taking place at the first digit, storage device which will now be explained. At the same time that a circuit is comlected that this holding conductor is still' grounded in each-of the other threestorage devices) ,the removal of ground from coir ductor 288, at armature 256, whereby ground is disconnected from bank contact 294: in the bank of the sending switch S; and the grounding of conductor 286 at the same armature 256, whereby ground is extended by Way of the energizeddigit relay 325 of the second digit storage device, and con ductor 265 to bank contact 295 ofthe-sending switch S. The operations so far described have resulted in the transniission of a series of four impulses to the selector 1), or more specifically speaking, the circuit of the line relay 65 of the said selector has been interrupted four timesand in response tothese interruptions the selector is operated to raise its Wiper to the fourth level, and at the end of the series of impulses it operates automatically to select an idle trunk leading to a second selector, such as the second solectorEt 9 Returning again to the operation of the sending switch, when the wipe'r 207 arrives at the twelfth contact in its associated bank, which is ungrounded, the circuit of the slow acting relay 201 is broken and after aninstant this relay will fall back, thus opening the lockingcircuit of slow acting relay 200 andat' the same time closing the normal shunt circuit around the impulsing contact at armature214 ofthe impulsing relay 202'. Its circuit having been broken, the slow act ing relay 200also deenergizes after a brief instant and at its armature 211 again closes the circuit of the. impulsing relay 202. This relay now beginsoperating as before and on its first energization' transmits an impulse of current to the stepping magnet 206 without, however, interrupting the-switch control circuit over the: trunk line, which now ex tends through to the secondselector "On the first step of the sendingflswitoh S, wiper .207 arrives at then-thirteenth bank contact' and since this contact is grounded a'circuit i:'

When Wiper 208'arrives atzthe eighteenth contact'in its associated bank, which contact is'connected in multiple with the: bank con tact: 295, a'circuit willbe completed for re lay 1 200, 1 and this relaywis" energized as 'before to open the circuit of the impu'lsing' res 7 tacts.

magnet 206, in order to drive the switch S. 'It is understood, of course, that lay 202 and thus stop the further transmission'of impulses. Belay200also closes the usual circuit for continuing the operation of the stepping magnet 206 and the sending switch is, therefore, continued in motion until the wiper 207 arrives at the next ungrounded bank contact, which the twenty fifth. At the sametime that relay 2001s energized, a c1rcu1t iscompleted by way of conductor-s 2 27 and 287 for relay 302 in the second digit storage device and the said relay 302* is energized. As the sending switch continues itsadvance, this circuit is broken and relay 302 becomes locked in series with relay 301 to the grounded conductor 285. Relay 301 is accordingly energized and at its armature 306 disconnects conductor 287 from the windingof relay 302 and transfers it by Way of conductor 387 to a similar relay in the third digit storage device. In addition, relay 301 disconnects the grounded conductor 286*from conductor 388, therebyre moving ground from the bank contact 295 in the bank of the sending switch S, and

transfers it into connection with conductor 386,whereby ground is extended by way of the now energized sixth digit relay in the third digit storage device, to bankcontact 296 in the bank of the sending switch, and at armature 308 of relay 301 the ground connection to the holding conductor 223 in the second digit storage device is broken.

The second series of operations at the operators sending equipment resulted in the transmission of five impulses to the selector E, or rather in'the' production of five interruptions in the 'circuit of its line relay 90, whereby the switch shaft and wipers are raised opposite the fifthlevel of bank con- Uponthe cessation ofjth-e series of impulses, the second selector E automatically operates to select an idle trunk leading to a connector switch, such as the connector H,

Fi .4. gVhen the wiper 207 of the sending switch arrives at thetwent'y-fifth bank contact it finds this contact ungrounded, the advance of the switch isstopped temporarily, and relay 201 is deenergized, thus again shunt ing theimpulsing contact at armature 214. Aftera brief further interval, the slow acting relay 200 will fall back and again close the circuit of impulsing relay 202, which now begi'nsoperating as before, and produces a seriesofinterruptions in the control circuit of the connector H to operate this switch vertically, while at the same time the impulses are transmitted to the stepping sending the first energization'of relay 202 is ineffective to interrupt the control circuit. It will be unnecessary to minutely consider all the epera'tionswhich take place during the transmission of th'e'third and fourth series contact in its bank, and which closes a circuit over conductors. 227, 287 and387 to the relay in the third digit. storage device which corresponds to relay 302 of the second digit storage device. Upon the removal of ground. from conductor 227 bythe further. advance of the sending switch S a relay in the third digit storage device, correspondingto relay 301 of the second digit storage device, is energized and various transfer operations take place which result in the removal of ground from bank contact 296and in the grounding of bankcontact 297. p

The connector H responds tothe third series of impulses, and its'shaft and wipers are raised five steps until they stand oppoite the fifth level of bank contacts. No: automatic movement takes place at the connector, however, upon the cessation of the series of impulses and further movement of the connector is deferred until the arrival of the next series of impulses.

When the wipers ofthe sendingswitch S arrive at the twelfth set of bank contacts, wiper 207 will find. no ground and relays 201 and 200 are accordingly deenergizedto again start the operation of the switch; The impulsing relay 202 now begins to step the switch S around as before, and after the said conductor and conductors 287 and. 387

and thence by way of a similar conductor, in the third digit storage-device, to a relay in the fourth'digit storage device, which corresponds to relay 302 of the second digit storage device." As the sending switch continues its advance ground. is removed from conductor 227, whereupon a transfer relay in the fourth digit storage device, which corresponds to transfer'relay 301 of the second digit storage device, is energized. Since the fourth digit storagedevice is the last one, it will be apparent' that those conductors, corresponding to conductors 385,

386, and 387, will beomitted, and the prin cipal result of the operation ofthe transfer relay is the removal of ground from the holding conductor 223. Ground has already been-removed from this holdin 'conductor at each of the] other three storage devices, and it follows that conductor 223 will now be entirelyjclear of ground. At the same time that conductor 223 is cleared, conductor 224 is cleared of around also for thisconductor 7 has through its connection with conductor 223 at armature 52-oi relay 45. The removal offground from "conductor 224 permanentlyopens' thepcircuit of; the impulsing relay 202 and thus prevents any further operation of the sending switch S at this time. The removal of ground from conductor 224 also causes the deenergization of'the slow acting relay 204, which opens the circuit of the slow acting'relay 205. at armature 217 and at the same time disconnects ground from conductor 226 at armature 218. As a result ofthe latter operation, and. beforerelay 205 deenergizes, relays 250, 251, 252, and 274 of the first digit storage device are deenergized. Relay" 252, upon deenergizing,opens the circuit of relays 253 and 254 which. are thus deenergized also, and also removes ground from conductor 285 at armature 259. By the latter operationrelaysl, 302, 303, and 325 of the second digit storage device are deenergized. Relay 303 upon. deenergizing, removesground from. conductor 385 extend-- ing to the third digit storage device, and

as a result the corresponding relays in this storage device are deenergized also. In a similar way, the relays in the fourth digit. 'storage'device, which have been locked up,

are cleenergized an instant later. The operators sending equipment, including the four digit storagedevices and the sending switch S, is thus entirely restored to normal position and is ready for use again in regis tering another telephone number.

At the trunk line, Fig. 2, when ground is removed from the, holding conductor 223the' locking circuit of relay is broken and thus the relay is accordingly deenergized. As a resultthe circuitof relay 44 is broken, but

I i this relay remains locked up to'thegrounded conductor 56 at its armature 48. By the deenergization of relay 45, the incoming coni ductors 30 and 310i the inter-oflice trunk line. are connected through the two condensersby Way ofarmatures 47 and 49 of relay 44, andthrough the normally closed sets of contact springs controlled by'relays' 45 and 46 to the outgoing trunk conductors and 61, which "have-been extended by the operation of selectors D andE and theconnector H,fto the desired called line; It will be observed that there is a bridgeacross the trunk.

conductors 60 and61 at the Boperators position which includes the impedance coil 43 and upper -'winding of the electropolarized. relay 42-. Thus, the. continuity of the switchfcontrolcircuit extending through to thenjconnector is preserved and the been maintained grounded idle. If this trunk line switches are prevented from releasing. The two windings of relay 42 are in oppositionat this time and consequently this relay is not operated.

The operation of the automatic switches will now be explained a little more in detail, in order that the entire system, may be fully understood without referencefto other publications. As previously explained, the control circuit of the first selector D includes sending switch S, and the trunk conductors 60 and 61, and when the first series of interruptions is produced in this circuit by the intermittent impulsing relay 202 of the said sending switch, the line relay 65 of the first selector is caused to retract its armature a corresponding plurality of times. At each retraction of its armature, relay 65 sends a current impulse through the slow acting series relay 67 and the vertical magnet 70 in series, and the vertical magnet is oper ated to raise the switch shaft step by step until the wipers 80, 81, and 82 stand opposite the fourth level of bank contacts- Relay 67 is energized in series with the vertical magnet, and being slow acting retains its armature in operated position throughout the vertical movement of the switch. At the first upward step, the off normal springs 78 are closed and since relay 67 is in operated position a circuit is completed for the stepping relay 68. Upon energizing, relay 68 establishes a locking circuit for itself at its, upper armature,.and at its lower armature prepares a circuit for the rotary magnet 71. At the end of the vertical movement of the switch, the slow acting relay 67 is deenergized and closes the circuit of the rotary magnet 71 which accordingly operates to rotate the switch shaft one step and brings the switch wipers into engagement with the first set of bank contacts inthe fourth level. At the same time the rotary magnet opens its interrupter contact and thus breaks the locking circuit of the stepping relay 68, which accordingly deenergizes and breaks the, circuit of the rotary magnet whichther'eupon deenergizes also and again closes its interrupter contact. The operation now depends upon whether the trunk line te'rmi nating in the'first set of contacts is busy or is busy, there will be aground potentialon the test contact engaged by the test wiper 81 and thestepping relay 68 will again be energized, resulting in another closure of the rotary magnet circuit and the advance of the switch wipers into engagement with. the second set of: bank con- WVhen the first idle the conductors 2'21 and 222 coming from the ground potential on the test contact 84: and the stepping relay 68-wi'll' not again be oper ated, Instead; the switching relay 69, which has-heretofore-been short' circuited, is energized in series withthe stepping relay 68,;the latter relay; remaining inoperativedue to=the high resistance ot the said'swi-tch ingrelay. Upon energizing, relay 69- grounds; the test wiper 81 at its armature 7 5 in order to make" the selected trunk" line" busy, and at its'a'rrnatures Tt-and 77-"clisconnects the trunk conductors and 61 from the winding of the line' relay 65 -andextends then'rby way of wipers and 82,- bank contacts 83 'and' 85', conductors 86' and 88,- andarrnatures- 94 and 96* and their resting contacts to the upper andlower windings of the linerelay-90 ofthe second selector'E.

When the trunk conductors are extended to the selector? E, as above described, the" line relay-90isenergized and closes a: cir cuit for the slow acting release re1ay-911 Upon energizin relay 91 prepares the selector for operation in its'vertical movemerit-"in the usual manner, and also connects ground to the release=trunk conductor 87, thereby establishing a holding circuit-1 which. ext'endsb'y way of said conductor 87, test contact 84-, test wiper-81; armature 5- -and itsworking contact, winding ofthe; switching relay- 69, interrupter contacts of the rotarymagnet 71, ofi' normal springs/78, and the winding'of the stepping rel'ayi 68 to'batter'y.

The operations just described whereby trunk conductors 60 and 61 have beenv extendedt'hroughto the" second selector E have occurred in response to" the transmissi'oni ofth'e first series of' impulses by the sending" switch" s; The automatic rotary movement of thfesel'ector-D inselecting' an idle; trunk linein-theparticular level, which was selected-under the directive control of the sender; takes place during. the time in; tervalbetweenthe transmission of the first and second series of impulses, It will be recollected, that this time intervalj isj introduced' by} the-relays 201' and 200, of the sending switch, which are slow actingand which, therefore, require an gap'precla ble length" of time to tall back. It maybe apprehended; that an additional time interval is-introduced between each two series of impulses; owingto'the fact that the sending" switch- '8" is' forced to complete its travel from one :of its normal positions to the next eachtimea series ot'impulses is'transniitted. This isfitr'ue to a certain extent, but the time interval thus introduced is-so short as to be inappreciable: The switch S travels over-itsbank contacts-atairate of about sixty per seeond when it is advancing its wipersautomatically.'

When the next series of im ulses come in over the trunk conductors till and- 61; the-linere'l'ay 90 of the second selector E is deener-* gfized a lurality oftimesand controls the vertical magnet 92 to raise the shaft and wipers 100 102, inclusive, tothe fifth level, the second digit in the number being the digit 5, as explainedheretofore. The-operation of the second selector E'is precisely the same as that of the first selector'D, and consequently it willjbe unnecessary to consider it in detail. It will' be suflic'ient to say that at the end ofthe vertical movementof the switch, the rotary movement is initiated automatically and the wipers are rota-t ed step-by step in search of. an idle trunk line leading to a connector switch. Assumingthatthe first idle trunk line encountered is the one shown in the drawing and extending-to the connector H, Fig, 4:,

when the test wiper 100 arrives attest conconnector On the extensiono'f the control circui-tto the connector H in the'above manner, the line relay-111 is energized and completes a circuit for the slow acting release relay 1'12; Upon energizing, relay 112 prepares the connector for operation in its vertical move ment in the usual wayand'at' armature 12!? connects ground to the" release trunk con ductor 107. A holdingcircuit is thus estab lished which extends by way ofthe said conductor 107, test' contact 104*, test wiper 101, and armature and its working-con-- tact, to conductor 87 where it joins a previously described holding circuit extending.

back to the first selector D; The switching relay 99 at the second selector E is connected to the holding circuit the same" as was described in the case otthe switching-relay 69* of the first selector.

When thethird series of impulses,- corresponding tothe digit 6, are transmitted'over the control circuit by the operators sender, the line relay 111 of'the connector H is 1110- inentarily deenergized six times and at each deenergiz'ation transmits an impulse of current to the vertical magnet 118- over path whichextends from'groun'dby way of armature-124C and its resting contact, armatare- 126 and its working contact,- oftnorma l springs 121 and 123, winding ,otthe slowacting series relay 113, and: the winding of 'the-vertical magnet 118 tobattery. By the:

operationof the vertical magnet the wipers v 150-152, inclusive, are raised step by step until they stand opposite the sixth level of bank contacts. Relay 113 is energized in series with the vertical magnet 118 and being-slow acting holds up continuously during thevertical operation of the switch. By the operationxof this relay, the vertical magnet. circuit is preserved intact, notwithstanding the shifting of the off normal springs, which occurs at the first vertical step oflthe switch. At the end of the vertical movement, relay 113 deenergizes and transfers the operatingcircuit to the rotary magnet 119.

The last series of impulses comprises seven:

interruptions in the control circuit corresponding to the final digit 7 of the called telephone number. Responsive to these interruptions the line relay 111 is dQBIlBIglZBd seven times and now sends impulses 'tothe rotary magnet 119 ver the following c1rcu1t: From ground byway of armature 124 and its resting contact, armature 126 and'its working contact, oil normal springs 121 and 122,

armature 127 and its resting contact, resting contact of armature 132 and the said armature, armature 139 and its restingcontact, and the winding of the rotary magnet-119 to the battery. By the operation of the rotary magnet, the wipers 150-152, inclusive, are rotated step bystep and are finally brought to rest in engagement with the particular set of bank contacts in whichthe line of sub- I station, A is terminated, thesecontacts being indicated in the drawings by reference characters 153, 154 and 155. The slowacting relay 116 is energized in parallel with the I rotary magnet and remains continuously en-.

ergized during the rotary movement. In operated position, relay 116 connects the test wiper 151 to the winding of the test relay 115 by meansof its armature 133 and at armature 135 closes an alternative point in the circuit of the rotary magnet, to guard against the possibility of having this circuit opened by the operation of the test relay while the test wiper 151 is passing over grounded test contacts. v I i The final series of impulses has now been received, and the connector wipers have been,

placed in connection with the terminals" of the called line. If the-line is busy there will be a ground potential on the test contact 154 and the test relay 115 will be energized.

When this relay operates it prepares a locking circuit for itself at its armature 131, which is completed when the slow acting re lay 116 falls backan instant later, opens the rotary magnet circuit at armature. 132, and

at armature 134 connects a lead from the busy signalling machine to thelower side of the line. By this time the relay at the B operators position has been deenergized, the

operators sender has been disconnected, andthe trunk. conductors 30 and 131 have been connected through; by way of thecondensers to the trunk conductors and 61, respectively, all as previously explained. It will be evident then that an audible busy signal will be transmitted to the calling subscriber in the distant manual exchange. On perceiv-' ing the signal, the subscriber will replace his receiver thereby signalling the operator who will pull down the connection and the automatic switches will be released, as will be explained subsequently.

Suppose now that the called line is idle when connection therewith is attempted. Under these circumstances there will be no ground on the test contact 154, and the test relay 115 will not be energized. 'lhen'when the slow'acting relay 116 falls back acircuit is completed for the switching relay 117 which may be traced from the grounded conductor 107 by way of armature 131 and its resting contact, the upper winding of the, 2

switching relay 117, restingcontact of ar mature 133 and the said armature,testwiper 151, test contact 154, winding of the cut off I orswitching relay 162 of the line switch 0, and winding of'the stepping magnet 164 to battery. in series over this circuit,and the latter relay iseflective to clear the line, conductors 160 and'16l of their normal'battery and ground connections in the line switch. It may be explained that'owing to amechanical interlocking device between the armatures of the switching relay 162. and the line relay 163,lthe former relay is operated only about half way Relays117. and 162 are energized at this time, and the wipers of the line switch arenot connected; up. 1

At the connector H, when the switching relay 117 pulls up, itestablishes a locking c1rcu1t for itself at armature 138, grounds vthe test wiper'l51 at armature 137, opens the rotary magnet circuit at armature. 139 and at armatures Y136 and 140 connects up the two line wipers 150 and 152. By the lat-, i

ter operation a signalling circuit is established whereby ringing current from the generator GEN is intermittently projected out over the called line to operate the bridged ringer at substationlA and notify the called subscriber that heis wanted. The return path for theringingcurrent includes the upper winding of the ring out off relay 114,.and

when the called subscriber answers this relay 1s operated. Upon energizing, relay 114-establishes a locking circuit for itself at its armature 129, breaks the ringing circuit at armatures 128 and 130, and at the working contacts ofthese same armatures pletes the talking connection.

Current is now supplied to the transmitter at substation A through the windings of the double wound back bridge relay which is accordingly energized. This relay is a reversing relay and has the well known funcfinally com-' mass tion of reversing the incoming trunk conductors 106 and 108 asregar-ds their connections with the windings of the line relay 111. It will be recalled how that the circuit of the line relay 111 is completed by way of the bridge through the impedance coil 43, and the upper winding of the electropolarized relay 42 in the trunk equipment at the B operators position, the operators sender having been disconnected .by this time, and the Operation of the reversing relay 110, there= fore, will reverse the direction of current flow in the trunk line and more particularly in the bridge thereof which includes the upper winding of the said electropolarized relay 42. As a result, .the two windings of this relay now co operate and it is able to attract its armature whereby the upper high resistance winding of relay 40 is shunted by means of the relatively low resistance impedance coil 41. Relay 40 remains energized, owing to the fact that its lower winding is still connected in the bridge across conductors 30 and 31-, and the result of shunting out the upper high resistance winding of this relay is to augment the flow of current sufliciently'to operate the supervisory relay 7 at the operators cord circuit in the manual exchange. This serves to extinguish the supervisorylamp L and notifies the operator that the called subscriber in the automatic. exchange has answered his telephone. The subscribers may now converse as desired;

When the subscribers are through talking, they will replace their receiver's. By the replacement of the receiver at substation A, the supervisory relay 8 is deenergized, and the supervisory lamp'L is lighted- When the subscriber at substation A replaces his receiver the. back bridge relay 110 in the connector H is deenergized and the direc tion of current flow in the section of the trunk to the right of the condensers is reversed to normal thereby causing the electropclarized relay 42 to retract its armature. By this operation the upper high resistance winding of relay 40 is again included in the circuit of the supervisory relay breaks the locking circuit of relay 44:. On

deenergizing, relay 44 opens the trunk line at armatures 47 and 49, thereby clearing the bridge across the trunk conductors 60 and 61'. As a result, the line and release relays 111 and 112 of the connector H are permitted to fall back and these relays jointly close a circuit for the release magnet 120, whereby the connector is restored to normal in the usual manner. Relay 11 2' also rcm'ovesground .from the release-trunk conductor .107 and this operation breaks. the holding circuit for the switching relays 69 and 99 of the selectors D and E, respectively. These relays are, therefore, deenergiz'ed and circuits are completed for release magnets 72 and. 93 which operate to restore their associated switches to normal position. All the apparatus is thus returned to normal and is ready for use in setting up other connections.

It will be seen from the foregcingthat I have devised a simple and eflicient arrange ment of circuits and apparatus for handling calls between manual and automatic exchanges, introducing a variety of new features which not only simplify and reduce the cost of the equi ment, but add to the speed and facility with which necessary duties are performed by the operators. 7

Having describedmy invention, what I consider to be new and desire to have pro tected by Letters Patent will be pointed out in the appended. claims.

What I claim is:

1. In a telephone system, A and B operators positions, trunk lines coming from the A operators position and passing through the B operators position to automatic switches, other automatic switches, means for manually connecting a calling line with one of said trunk lines at the A operators position, an operators sender at the B position comprising a progressively movable sending switch and a plurality of storage devices, said sending switch including a contact dc vice, means whereby the B operator can register the digits in the number of the called line on said devices, means for connecting the sender with the trunkjline in use, means whereby the sending switch is then controlled by said storage devices successively to transmit series of impulsesover the trunk conductors by means or said contact device to operate a series of said switches to connec't with the called line, and means for automatically disconnecting the sender when the connection is completed.

2. In a telephone system, A and B operators positions, trunk lines coming from the A operators position and passing through the B o'perators position to automaticswitches, other automatic switches, a call circuit x tendin between said positions whereby the A operator can transmit a desired called number to the B operator, an operatorssender at the B position comprising a progressively movable sending switch and a plurality of storage devices, said sending for'connecting a calling line with 'a particular one ofsaid trunk lines assigned by the B operator over sald call circult, means whereby the B operator can connect said of digit keys sender with the trunk line assigned, and means for then automatically operating said sending switch under the control of said storage devices to, transmit a plurality of series of 'impulses'over the trunk conductors, bymeans of said interrupter to operate a series of said switches to complete the, connection to the calledlinea a v i 3. In an operators sender for controlling automatic'switches, a set ofdigit keys, one for eachdigit, a plurality of storage devices each comprising a set of digit relays, one relay for each digit, means whereby the successive actuation of a plurality causes the energization of a particular digit relay in each of said storage devices, an impulse sending mechanism, and means for'placing said mechanism-- under control of said storage devices successively. i

4. In an operators sender for controlling automatic switches,.a set of digitkeys, a plurality of storage devices each comprising a set of digit relays, the digit relays of the first device being normally connected with saidkeys, and transfer relays andcircuits effective to disconnect the digit relays of one device from said keys and to condevice tothenext, means for energizing the corresponding digit relayin one of said devices when any digit key is actuated, and

means for energizing the transfer relay in said device in serieswith the energized digit relay when the actuated digitkey is restored.

6. In an operators sender for controlling automatic switches, a plurality of storage devices each comprising a set of digit relays, acommon set of digit keys, a transfer relayin each storage device nfor shifting the control of said keysfrom one storage device to the next, means for energizing a digit relay in" one of sald devices when a digit key is actuat-' ed, and means for energizing the transfer relay in said device inseries with the energized,

digit relay when the actuated digit key is restored,

. 7. In an'operators sender 'forcontrolling automatic switches,a plurality of storage devices each comprising a set of digit relays,

a common setof digit keys, a transfer: relay in each storage devicefor shiftingvthe con trol of said keystfrom one storagedevice to the next, means for energizing a digit relay in one of said devices when a digit keyis actuated, a self locking circuit: for the ener gized digit relay including the associated transfer relay, and-circuit connections such that current flow through said transfer relay is delayed until the actuated digit key is restored. a

8. In a telephone system, a trunk line terminating in an automaticflswitch, other switches, an operatorssender comprising a plurality of storage devices,-means for reg= istering a digit in a called number on each of said devices, a holding conductor, means for grounding said conductor at each storage device when a digit is registered, an impulse transmitting mechanism, a trunkurelay for connecting said mechanism with saidxtrunk line, a-locking circuit'for said relayincluct ing said conductor, means for operating said mechanism to transmit impulses to a series; of said switches under thecontrol of 'said storage devices successively, and means effective to disconnectground from the said conductor at each storage device-in turn as soon as the respective devices complete their con v trol over said mechanism, whereby the said conductor is i finally entirely disconnected from ground and the said trunk relay is deenergiz'ed. j 1 i 9. In an operators senderforzcontrolling automatic switches, a switch control'circuit, a step, by step switch, a constantlydriven interrupter, a relay intermittently energized by'said interrupter, contacts'on said relayfor interrupting said control circuit and other contacts on said relay for sending impulses of current to said, switch, and means for preventing saidcontacts from interrupting said control circuit before an effectivev impulse is sent to said switch by saidother contacts: I i v I 10 In an operators sender for controlling automatic switches, a switch control-circuit, a step by step switch, a relaygand'means for closing an intermittent ,fenergiz ing"circuit therefor, contacts on said relayfor interrupting said control circuit, contacts-on said relay for sending operating impulses to said switch, and circuit connections for-prevent ing the, saidcontrol circuit from; being'interrupted until said switch has befenmoved a definite distance. I 1 V I,

11. In an operators sender for controlling automatic switches, a switch; control circuit, a step by step switch, a relay and means for closing an intermittent energizing circuit; therefor, contacts on said relay for interrupt,-v

ing said control circuit, cont'actsionfsaid relay ofor sending operating impulses to vsaid switch, the said interrupting contactsbei-ng normally short circuited, and means con I mitmatic' switehes, aswitch control circuit,

a flt'ep b-y step sevv'iteli, a 1 relay andmeans for missing an intermittent energizing -ciTcuit thereio contacts -on said relay for inter- 'mpting saidyeontrol circuit, contacts on said 11 rl ay foi sendin'g openating'impulses =to= said mi itch,- and meanscontrdlletl in the movementof said 'sw'itch for -ope1iing the "energizi'ng circuit "of {said :relay after a definite -seri'es of interru'ption-s has been produced. 13. Inan operator s sen'de'r for controlling automatic switches, a i switch control circuit, ma-step 'by ste 'switeh, a relay'- an'(l uneans for i'elesi'n g :an intermittent energizing circuit therefor, contacts on said melay lor *int'ergqomupting said control circuit, contacts on nelay i'or sending o'pei ati'n'g impulses ato-sai'dsswiitch ,1means 'controlled in -the movennent rof said switch qfor openin-g tlie enercircuitrof said l-l'elay afiter a 'tlel'in'ite aeenies 2'1 of iinterruptions has heen :produced, aan'daa cimuitiiferautomatically: driving said swith to a manual j:position independent o'f waiderelay.

1 114. ilnz-anmperatorls-sender ion controlling a0 mutematio switches, switch control circuit, mmtepzby etepsswitdhaa relayzand means for m'l'osing aan :laintermittent i 'en'ergiz ing circuit ithmfur, rcimtacts Lon 'asaid relayf 'for in'terimpting smidleontrolcircuit;contacts: on said relay zi' or-mendingi'eperating aimpulses to said mitdnlmeans controlled in the movement amt i-sa'idrswitch Bfor xopening t-he energizing circuit ufzsaidsrelay ia'itter :a definite s'eiiiesxo f interruption'sihns aheen :produee'cl, 1a ECll'GUlt v40 afarautomaticallyrldrivingsaid switch .to a

manual e-pmsitien independent of *said relay, amid means effeutivein fiter a defi-iiite ttimeinteem-l ifUI. ingarin completing itlie i'energizing circuit said relay in :order ito produce '45 of interi'uptions.

5.16. alnmnnpemtnrls:sen'der fo'r. controlling untomtic-swv'itches, ;a switch control reireuit, aaatcp bgyshstepz sw-itch, :a relay :and means for closing an intermittent :energizing circuit '50 rthemior, icentacts rfllli fifid d relay for interrl itlitingisaidrcwnbroli circuit; contacts "on :said

.mhmy'yfm mding' operating impulses: to said mitchuwsct inf {digit keys, zineans respon'sivc .ito :itllel actuation of Ara cligit akey 'for groundsing it corresponding contact in the bank ref and switch, and .aa {second irelay energized nwer ja ofsaidiswitch whenzitengages the gmunneileontaet iornpening the: circuit nfmidifiisitrrelmy.

11331 11 n itelep'honie system, automatic connecting a callin an'tl' ca-lled vjjmenepeiater contrclled storage devices for registering the digits in the number-of the salted- Him, a Wieniil idigtt indicator "-for "enfiiiigmaempevater te chek the -aeeuracy-oi "the registration, and an impulse sending dewas *controlled by -'said*storage devices success'ively-tooperate a series of said switches to connect said lines.

17. --In a telephone system, automatic switches for connecting acalling and called line; operator 'con'trolled storage 1 devices for registering the digits in the number of the :"called line, a =visualdigitindicator for enabIing t-he operator to "check the accuracy of the registration, an impulsese'nding devic e controlled by said storage devicessuc- "cessively to operate a series of- -said switches to connect said-lines, and means for efi'acing :the number displayed by said indicator While said switches are being*operated.

l 8. in a telephone system, automatic switches for-connecting -a calling and called "li'ne, an {ODEPfltOPS *sender 'for controlling said-switches 1 and =.comprising operator controille'd registering devices for registering the =di'g'its in the number of the called line, keys eommon =to 'said devices fo'r fse'ttin'g ithe'm successively, and :a number indicator for enabling the -'operator to check the accuracy ofthe registration.

V "19.1n a "telephone system, automatic 5 switches "for connecting a calling and called line, an operators sender for controlling "said switches and comprising operator controlled registering devices for registering the digits in the number of the called line, key s common to-said devices for-setting them successively, a 1 number indicator comprising groups-of lamps, -an'd means for -lig'hting the roper lamps to display the registered numrer to the operator.

20. In a telephone system, automatic switches for connecting a calling and called line, an 'operators-senderfor controlling said N switches for connecting-a callingand called 7 l-irre,. an-:operator s sender Tor -controlling said switches, storage devices for controlling said senderaand err-which the digits in-thenumber of -thecalled .-line are registered successively and a visual indicator for displaying each digitto the operator as soon-as itis registered.

1. 22. ilnian operators sender for. controlling automatic switches, a control circuit over which-impulses aretransniitted to the said switches, a step by-ste'p sending switch "for determining the "number of I impulses transmitted, 'Ine'ans "for advancing said 1 switch at a slow "rate while impulses "are being transmitted,"means'responsive*to a predetermined movement or said switch for stopping the 

